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Originally posted by Stormgodess
Just wanted to give some information on the Circles located on the radar maps.
I am pretty sure they are Anomalous Propagation, If you notice, they are located at every location of a doppler radar. They often occur on the National Weather Service Mosaic map. Im not sure of the type of map shown in this thread. Here is an awesome site where Meteorologist Jeff Haby, explains in laymen's terms what Anomalous Propagation is, the different types of anomalies, and why they occur. From what I see they occur more often at night. In my opinion due to the temp fluctuations between ground level, and upper level temps. They can also be caused by bird and insect migration.
Anomalous Propagation is abbreviated as AP. AP and false echoes are one of the biggest enemies of the radar meteorologist. Those without experience in radar meteorology are often "burned" by AP and false echoes.
National Doppler Radar site locations:
In my opinion, I think the reason they are showing up more lately, is because the Radars themselves have improved over the years, but the software filters used to eliminate this type of artifact has not improved as much.
More info here...